[tone999]

Q. A soda-lime glass has a molar composition of 8% Na2O, 6% Ca2O and 86% SiO2. Find the atomic and weight percents of the various elements.

A. Na20 = 62, Ca2O = 96, SiO2 = 60

Na2O = 8x1/62 = 0.13
Ca2O = 6x1/96 = 0.06
SiO2 = 86x1/60 = 1.43

0.13+0.06+1.43 = 1.62

Na2O = 0.13/1.62x100 = 8.02%
Ca2O = 0.06/1.62x100 = 3.70%
SiO2 = 1.43/1.62x100 = 88.27%

                                   99.9%

Is this correct?

[MrTeo]

Hmm... I don't understand: Ca2O stands for CaO₂?

[tone999]

I guess its still calcuim oxide but with 2 atoms. Ca2o

Element   Symbol   Atomic Mass   # of Atoms   

Calcium      Ca         40.078             2        = an atomic mass of 80          
Oxygen        O         15.9994           1

Are my calculations correct?

[zxt]

Q. A soda-lime glass has a molar composition of 8% Na2O, 6% Ca2O and 86% SiO2. Find the atomic and weight percents of the various elements.

A. Na20 = 62, Ca2O = 96, SiO2 = 60

Na2O = 8x1/62 = 0.13
Ca2O = 6x1/96 = 0.06
SiO2 = 86x1/60 = 1.43

0.13+0.06+1.43 = 1.62

Na2O = 0.13/1.62x100 = 8.02%
Ca2O = 0.06/1.62x100 = 3.70%
SiO2 = 1.43/1.62x100 = 88.27%

                                   99.9%

Is this correct?

You can first assume the composite is 100 mole, and Na₂O is 8 mole,Ca₂O? is 6 mole, SiO₂ is 86 mole. Then you calculate the mass of the composite and ingredients to find the answer.